next-upgrade: prompt (un)install only when there's a change (#71308)
### Why?
When running next-upgrade, `next-request-geo-ip` requires to install
`@vercel/functions` and `built-in-next-font` makes `@next/font` no
longer needed. We added a prompt to ask user whether to (un)install it
at https://github.com/vercel/next.js/pull/71038 but it prompts even if
there were no transform occurred.
This is unnecessary layer so we only prompt when there's a change caused
from the codemod.
### No Modification
https://github.com/user-attachments/assets/3acfdb24-c8e7-4189-9c81-4765ce748822
### With Modification
https://github.com/user-attachments/assets/f44a8b1c-c75a-4446-afc8-f74111de939d
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